Every email consists of a local name and a domain name, separated by the @ sign. For example, in , is the local name, and is the domain name. Besides ...
分类:
其他好文 时间:
2020-01-27 09:33:24
阅读次数:
73
SELECT SUM(CASE WHEN sale_price <= 1000 THEN 1 ELSE 0 END) AS low_price, SUM(CASE WHEN sale_price BETWEEN 1001 AND 3000 THEN 1 ELSE 0 END) AS mid_pric ...
分类:
数据库 时间:
2020-01-25 15:37:53
阅读次数:
101
前言 大概几个月之前项目中用到事务,需要保证数据的强一致性,期间也用到了mysql的锁,但当时对mysql的锁机制只是管中窥豹,所以本文打算总结一下mysql的锁机制。 本文主要论述关于mysql锁机制,mysql版本为5.7,引擎为innodb,由于实际中关于innodb锁相关的知识及加锁方式很多 ...
分类:
数据库 时间:
2020-01-22 16:04:06
阅读次数:
90
1. The difference between classification and clustering. from here. Classification: supervised learning with labels. Clustering: unsupervised learning ...
分类:
其他好文 时间:
2020-01-22 01:06:15
阅读次数:
124
https://softwareengineering.stackexchange.com/questions/113256/what-is-the-difference-between-btree-and-rtree-indexing 52 BTree BTree (in fact B*Tree) ...
分类:
其他好文 时间:
2020-01-20 20:46:31
阅读次数:
76
C. Nice Garland You have a garland consisting of nn lamps. Each lamp is colored red, green or blue. The color of the ii-th lamp is si ('R', 'G' and 'B ...
分类:
其他好文 时间:
2020-01-18 16:29:37
阅读次数:
90
D. Diverse Garland You have a garland consisting of n lamps. Each lamp is colored red, green or blue. The color of the ii-th lamp is si('R', 'G' and ' ...
分类:
其他好文 时间:
2020-01-18 14:30:27
阅读次数:
92
众所周知,知识图谱是Google于2012年提出,用来优化搜索结果。经过多年的发展,知识图谱在人工智能的许多行业都拥有了成熟落地的应用。按照知识图谱的覆盖面来看,主要分为通用知识图谱与行业知识图谱。 This is why a “web” of notes with links between th ...
分类:
其他好文 时间:
2020-01-18 00:49:03
阅读次数:
525
The only difference between easy and hard versions is constraints. Now elections are held in Berland and you want to win them. More precisely, you wan ...
分类:
其他好文 时间:
2020-01-17 10:20:05
阅读次数:
118
仅供自己学习使用:/********************滤波结构体定义*****************/ typedef struct { ulong Out32L; /* The filtered value multiplied by coeff */ ulong Output; /* T ...
分类:
其他好文 时间:
2020-01-15 19:59:40
阅读次数:
81